Suppose That at Prices of $1, $2, $3, $4, and $5

Suppose that at prices of $1, $2, $3, $4, and $5 for product Z, the corresponding quantities supplied are 3, 4, 5, 6, and 7 units, respectively. Which of the following would increase the quantities supplied of Z to, say, 6, 8, 10, 12, and 14 units at these prices?

A) improved technology for producing Z
B) an increase in the prices of the resources used to make Z
C) an increase in the excise tax on product Z
D) increases in the incomes of the buyers of Z